Merge pull request #3677 from barronpm/fix-master-compilation

Fixed compilation error on master.

MediaBrowser.Model/Entities/MediaStream.cs

@@ -200,7 +200,7 @@ namespace MediaBrowser.Model.Entities
                             return result.ToString();
                         }
 
-                        return string.Join(' ', attributes);
+                        return string.Join(" ", attributes);
                     }
 
                     case MediaStreamType.Subtitle: